I'm with Mia. A game is a game. People can be addicted to anything--even food, shopping...and video games. That has much more to do with the person than the game.
WOW is not something to fear because of its basic nature. It doesn't have something inherent to it that "makes people go crazy." Would it really continue to be sold if it were as bad as all that?
I'm sorry about your friend's situation, Ania, but I really believe that one case--no matter how extreme and horrible--doesn't necessarily mean that the game itself is the problem. In fact, I could hold up Mia's DS as counterevidence: the game was taken away from him, and he didn't even debate it with her. Clearly for Mia's DS, WOW was a harmless hobby and not a dangerous addiction.
From everything I've read on this forum, it's clear to me that Mia and Cym are responsible parents. I just felt like I needed to say that for their sakes. Their interest in a game doesn't diminish that level of responsibility.